Question

for b how do you what do you do after completing the matching 5x and -x

Answer 1

3x - 2 - x = 7 - x
2x - 2 = 7 - x ......add x to both sides
2x + x - 2 = 7 - x + x
3x - 2 = 7...add 2 to both sides
3x - 2 + 2 = 7 + 2
3x = 9....divide both sides by 3
(3/3)x = 9/3
x = 3